Question

For the following system, use the second equation to make a substitution for y in the first equation.

2x + y = 5
y + 3 = 2x

2x + 2x - 3 = 5
2x + 3 - 2x = 5
2x + 2x + 3 = 5

Answer 1

y + 3 = 2x
y = 2x - 3
now sub 2x - 3 in for y back into the first equation
2x + y = 5
2x + (2x - 3) = 5

Answer 2

any questions ?

Answer 3

thank you so much! =))